Result of the EMER GEN Test Incorrect (Failure of the Switching)

TASK 24-24-00-810-806-A
Result of the EMER GEN Test Incorrect (Failure of the Switching)

1. Possible Causes

PACKAGE E-PUMP [2075GJ]
RELAY-EMER CONDITION (12XE)
wiring
CONTROL UNIT-CSM/G [1XE]
CNTOR-AC ESS BUS SWITCHING [3XC]
CSM/G [8XE]
RELAY-EMER GEN TEST CONDITION (16XE)
RELAY-EMER AUTO LOG CONDITION [17XE]
RELAY-EMER AUTO LOG CONDITION [18XE]
RELAY-RAT EXTN INHIB CONDITION (20XE)
RELAY-CSM/G EV SPLY MONG (22XE)
RELAY-SPEED CONDITION, 2 [3PH]
RELAY-BUS 1XP CTL [15XC]
RELAY-BUS 2XP CTL [16XC]
P/BSW-EMER ELEC PWR/EMER GEN TEST [23XE]
C/B-CSM/G /EV/MAN/SPLY [6XE]
C/B-ELEC/CSM/G /EV AUTO/SPLY [7XE]
CNTOR-ESS TR [3PE]
C/B-ESS TR/CNTOR/CTL [5PE]
LGCIU-1 [5GA1]
MODULE DIODE UNIT [2401VD]
diode module 1162VD

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 24-00-00-810-803-A	Circuit Breaker Tripped and/or C/B TRIPPED Warning
TSM TASK 24-24-00-810-805-A	Result of the EMER GEN Test Incorrect (Loss of the AC ESS Busbar)
AMM 24-24-00-710-001	Operational Test of the Emergency Generation System
ASM 242401
ASM 242402
AMM 24-24-34-000-001	Removal of the CSM/G Control Unit
AMM 24-24-34-400-001	Installation of the CSM/G Control Unit
AMM 24-24-51-000-001	Removal of the Constant Speed Motor/Generator (CSM/G)
AMM 24-24-51-400-001	Installation of the Constant Speed Motor/Generator (CSM/G)
AMM 24-25-55-000-001	Removal of the AC Essential Bus Switching Contactor
AMM 24-25-55-400-001	Installation of the AC Essential Bus Switching Contactor
ASM 243401
AMM 24-34-55-000-001	Removal of the Essential TR Contactor
AMM 24-34-55-400-001	Installation of the Essential TR Contactor
ASM 243801
ASM 246201
AMM 29-00-00-280-002	Check of the Internal Leakage of the Blue Hydraulic System
AMM 29-12-00-710-001	Functional Check of Blue Electrical Pump Pressure by Reading ECAM Indication
AMM 29-12-51-000-001	Removal of the Electric Pump
AMM 29-12-51-400-001	Installation of the Electric Pump

3. Fault Confirmation
Subtask 24-24-00-710-060-A

A. Hydraulic Test
(1) Do the operational test of the Emergency generation system (CSM/G test) AMM 24-24-00-710-001.
(a) If the operational test of the Emergency system with the Blue electric pump is not correct:

do the operational test of the Blue auxiliary hydraulic system AMM 29-12-00-710-001.

1 If the test is correct:

do the trouble shooting given in Para 3.B.

2 If the test is not correct:

replace the PACKAGE E-PUMP [2075GJ] AMM 29-12-51-000-001 and AMM 29-12-51-400-001.

a If the fault continues:

do the check of the internal leak rate AMM 29-00-00-280-002,
replace the defective unit.

Subtask 24-24-00-710-067-A ** ON A/C NOT FOR ALL

B. Electric Test
(1) Do the operational test of the Emergency generation system AMM 24-24-00-710-001.
(a) Do the trouble shooting given in Para. 4.B. when, during the operational test:
1 On the lower ECAM display unit:

The line between AC 1 bus and AC ESS bus comes on,
The line between DC 1 bus and DC ESS bus comes on,
The line between EMER GEN and AC ESS bus goes off,
The line between EMER GEN and ESS TR goes off,
The EMER GEN voltage and frequency come on green.

(b) Do the trouble shooting given in Para. 4.C. when, during the operational test:
1 On the lower ECAM display unit:

The line between AC 1 bus and AC ESS bus comes on,
The line between DC 1 bus and DC ESS bus comes on,
The EMER GEN voltage and frequency are shown in amber.

The line between DC 1 bus and DC ESS bus comes on,
The line between ESS TR and DC ESS bus goes off.

(d) Do the trouble shooting given in Para. 4.E. when, at the end of the operational test:
1 On the EMER ELEC PWR section of the panel 21VU:

When the EMER GEN TEST pushbutton switch is released, the CSM/G and the Blue electric pump do not stop automatically.

(e) Do the trouble shooting given in Para. 4.F. when, during the operational test:
1 On the EMER ELEC PWR section of the panel 21VU:

when you push the EMER GEN TEST pushbutton switch (23XE) and also when you keep it pushed, the CSM/G (8XE) and the blue electrical pump (2075GJ) start and stop after 10 seconds.

Subtask 24-24-00-710-067-B ** ON A/C NOT FOR ALL

The line between AC 1 bus and AC ESS bus comes on,
The line between DC 1 bus and DC ESS bus comes on,
The line between EMER GEN and AC ESS bus goes off,
The line between EMER GEN and ESS TR goes off,
The EMER GEN voltage and frequency come on green.

(b) Do the trouble shooting given in Para. 4.C. when, during the operational test:
1 On the lower ECAM display unit:

The line between AC 1 bus and AC ESS bus comes on,
The line between DC 1 bus and DC ESS bus comes on,
The EMER GEN voltage and frequency are shown in amber.

The line between DC 1 bus and DC ESS bus comes on,
The line between ESS TR and DC ESS bus goes off.

(d) Do the trouble shooting given in Para. 4.E. when, at the end of the operational test:
1 On the EMER ELEC PWR section of the panel 21VU:

When the EMER GEN TEST pushbutton switch is released, the CSM/G and the Blue electric pump do not stop automatically.

(e) Do the trouble shooting given in Para. 4.F. when, during the operational test:
1 On the EMER ELEC PWR section of the panel 21VU:

When you push the EMER GEN TEST pushbutton switch (23XE) and also when you keep it pushed, the CSM/G (8XE) and the blue electrical pump (2075GJ) start and stop after 10 seconds.

(f) Do the trouble shooting given in Para. 4.G. when, during the operational test:
1 On the EMER ELEC PWR section of the panel 21:

When you push and hold the EMER GEN TEST pushbutton switch (23XE):

a On the lower ECAM display unit:

There are no EMER GEN and ESS TR indications with their related parameters.
There are no green lines between the EMER GEN and the AC ESS busbars, the EMER GEN busbar and the ESS TR, the ESS TR and the DC ESS busbar.

4. Fault Isolation
Subtask 24-24-00-865-052-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
105VU	ELEC/CSM/G /EV AUTO/SPLY	7XE	C01
106VU	CSM/G /EV/MAN/SPLY	6XE	B04
106VU	ESS TR/CNTOR/CTL	5PE	C02

Subtask 24-24-00-810-056-A

B. If the test confirms the fault:

replace the RELAY-EMER CONDITION (12XE).

(1) If the fault continues:

do a check and repair the wiring between respectively:
. the pin X of the CSM/G control unit (1XE) and the pin A/X of the EMER CONDITION relay (12XE)
. the pin A/Z of this relay (12XE) and the ground
ASM 242402.

Subtask 24-24-00-810-057-A

C. If the test confirms the fault:

On the EMER ELEC PWR panel 21VU, open the guard, push and hold the EMER GEN TEST pushbutton switch and at the same time
do a check for 28VDC on the pin A/b of the CSM/G control unit (1XE)
ASM 242402

NOTE: There is 28VDC during 6 s only.

(1) If there is 28VDC:

Replace the CONTROL UNIT-CSM/G [1XE] AMM 24-24-34-000-001 and AMM 24-24-34-400-001.

(a) If the fault continues:

Do a check of the wiring ASM 242402 between:
. The pin A/X of the CSM/G control unit (1XE) to the pin B/M of the AC essential-bus switching-contactor (3XC),
. The pin B/P to the pin A/M of the AC essential-bus switching-contactor (3XC),
. The pin A/P of the AC essential-bus switching-contactor (3XC) to the pin X of the emergency GLC (2XE),
. The pin Z of the emergency GLC (2XE) to the ground.

1 If the wiring is not correct:

Repair the wiring .

2 If the wiring is correct:

Replace the CNTOR-AC ESS BUS SWITCHING [3XC] AMM 24-25-55-000-001 and AMM 24-25-55-400-001.

(b) If the fault continues:

Do a check and repair the wiring between:
. The pin A/N of the CSM/G control unit (1XE) and the pin 4/A of the CSM/G (8XE)
. The pin 4/B of the CSM/G (8XE) and the ground.

Replace the CSM/G [8XE] AMM 24-24-51-000-001 and AMM 24-24-51-400-001.

(d) If the fault continues with the Blue electric pump in operation:

Replace the PACKAGE E-PUMP [2075GJ] AMM 29-12-51-000-001 and AMM 29-12-51-400-001.

(2) If there is not 28VDC:

Replace the RELAY-EMER GEN TEST CONDITION (16XE), RELAY-EMER AUTO LOG CONDITION [17XE] , RELAY-EMER AUTO LOG CONDITION [18XE] , RELAY-RAT EXTN INHIB CONDITION (20XE), RELAY-CSM/G EV SPLY MONG (22XE), RELAY-SPEED CONDITION, 2 [3PH] , RELAY-BUS 1XP CTL [15XC] , RELAY-BUS 2XP CTL [16XC] and P/BSW-EMER ELEC PWR/EMER GEN TEST [23XE] .

(3) If the fault continues:

Do a check of the status of the circuit breakers (6XE) and (7XE).

(a) If they are closed:

Do a check and repair the wiring between respectively:
. The circuit breaker (6XE) and the pin 7 of the pushbutton (23XE)
. The pin 8 of the pushbutton (23XE) and the pin A/X of the relay (16XE) through the relays (15XC) and (16XC)
. The circuit breaker (7XE) and the pins A/X1 and A/B2 of the relay (20XE), through the relays (17XE) and (18XE)
. The pin A/X2 of the relay (20XE) and the ground, through the relay (3PH)
. The pin A/B1 of the relay (20XE) and the pin A/X1 of the relay (22XE)
. The pin A/X2 of the relay (22XE) and the ground
. The pin A/B1 of the relay (20XE) and the pin A/b of the CSM/G control unit (1XE), through the relays (22XE)
ASM 242402.

(b) If the circuit breaker (6XE) is open:

Do the procedure (Ref. TSM TASK 24-00-00-810-803).

1 If the fault continues:

Replace the C/B-CSM/G /EV/MAN/SPLY [6XE] .

Do the procedure (Ref. TSM TASK 24-00-00-810-803).

1 If the fault continues:

Replace the C/B-ELEC/CSM/G /EV AUTO/SPLY [7XE] .

(4) If the fault continues:

Do a check of the wiring of the timer (33XE) electrical circuit (Ref. TSM TASK 24-24-00-810-805).

Subtask 24-24-00-810-058-A

D. If the test confirms the fault:

Replace the CNTOR-ESS TR [3PE] AMM 24-34-55-000-001 and AMM 24-34-55-400-001.

(1) If the fault continues:

Do a check of the status of the ESS TR CTL SPLY circuit breaker (5PE).

(a) If the circuit breaker is closed:

Do a check and repair the wiring between:
. the pin A/G of the ESS TR contactor (3PE) and the pin B/F of the ESS TR (1PE)
. the pin A/E of the contactor (3PE) and the pin A/G of the contactor (4PC)
. the pins A/G and B/3 of the ESS TR contactor (3PE) ASM 243401 and ASM 246201.

(b) If the circuit breaker is open:

Do the procedure (Ref. TSM TASK 24-00-00-810-803).

1 If the fault continues:

Replace the C/B-ESS TR/CNTOR/CTL [5PE] .

Subtask 24-24-00-810-064-C

E. If the test confirms the fault:

do a check for ground at the pin A/Z of the CSM/G control unit (1XE) ASM 242402.

(1) If there is a ground:

replace the CONTROL UNIT-CSM/G [1XE] AMM 24-24-34-000-001 and AMM 24-24-34-400-001.

(2) If there is no ground:

replace the RELAY-SPEED CONDITION, 2 [3PH] .

(a) If the fault continues:

do a check for ground at the pin AA/2D of the LGCIU-1 (5GA1) ASM 243801.

1 If there is no ground:

replace the LGCIU-1 [5GA1] .

2 If there is a ground:

do check and repair the wiring between:
. the pin AA/2D of the LGCIU-1 (5GA1) and the pin A/B of the relay (3PH),
. the pin A/3 of the relay (3PH) and the pin A/Z of the CSM/G control unit (1XE).

Subtask 24-24-00-810-066-A

F. If the test confirms the fault:

Do a check of the wiring ASM 242401 for a short to ground or a short to shield condition between:
. Pin A/F and A/G of the CSM/G Control Unit (1XE)
. Pin A/F and A/H of the CSM/G Control Unit
. Pin A/F and A/J of the CSM/G Control Unit.

(1) If the wiring is not correct:

Repair it.

(2) If the wiring is correct:

Do a check for an open circuit and repair the wiring ASM 242401 between:
. Pin 2/F of the CSM/G (8XE) and pin A/G of the CSM/G control unit (1XE)
. Pin 2/G of the CSM/G and pin A/H of the CSM/G control unit
. Pin 2/H of the CSM/G and pin A/J of the CSM/G control unit.

Subtask 24-24-00-810-068-A ** ON A/C NOT FOR ALL

G. If the test confirms the fault:
(1) Replace the RELAY-EMER AUTO LOG CONDITION [17XE] .
(a) If the fault continues:

Disconnect electrical connector A from the control unit CSM/G (1XE) AMM 24-24-34-000-001.
On electrical connector A, make sure that ASM 242401:
The voltage between pins A/a and A/c is approximately 25VDC.
There is no voltage between pins A/b and A/c.
The ground on pin A/Z is correct.
Connect a voltmeter between pins A/b and A/c.
Push and hold the EMER GEN TEST pushbutton and make sure that ASM 242401:
The voltage is approximately 25VDC during six seconds.
There is no ground on pin A/Z.
Release the EMER GEN TEST pushbutton switch.

1 If the result of the test is correct:

Replace the CONTROL UNIT-CSM/G [1XE] AMM 24-24-34-000-001 and AMM 24-24-34-400-001.

2 If the result of the test is not correct:

Connect electrical connector A to the control unit CSM/G (1XE) again AMM 24-24-34-400-001.
Continue the trouble shooting.

(b) If the fault continues:

Remove the CSM/G electro-valve supply monitoring-relay (22XE).
Connect a voltmeter between pin A/B2 on the base of the CSM/G electro-valve supply monitoring-relay (22XE) and the ground ASM 242402.
Push the EMER GEN TEST pushbutton switch and make sure that the voltage is approximately 28VDC.

1 If there is 28VDC:

Replace the RELAY-CSM/G EV SPLY MONG (22XE) and MODULE DIODE UNIT [2401VD]

2 If there is no 28VDC:

Replace the RELAY-RAT EXTN INHIB CONDITION (20XE).

Remove the RAT extension inhibit condition relay (20XE).
Push and hold the EMER GEN TEST pushbutton switch and make sure that the voltage between pins A/X1 and A/X2 on of RAT extension inhibit condition-relay (20XE) is approximately 28VDC ASM 242402:

1 If the voltage is correct:

Replace the RELAY-RAT EXTN INHIB CONDITION (20XE).

2 If the voltage is not correct:

Do a check of the voltage between pin A/X1 on the base of the RAT extension inhibit condition-relay (20XE) and the ground ASM 242402:

a If there is voltage:

Replace the RELAY-SPEED CONDITION, 2 [3PH] , RELAY-EMER GEN TEST CONDITION (16XE), diode module 1162VD and C/B-ELEC/CSM/G /EV AUTO/SPLY [7XE] .

b If there is no voltage:

Replace the RELAY-EMER GEN TEST CONDITION (16XE), RELAY-EMER AUTO LOG CONDITION [17XE] , RELAY-EMER AUTO LOG CONDITION [18XE] , C/B-ELEC/CSM/G /EV AUTO/SPLY [7XE] , RELAY-BUS 1XP CTL [15XC] , RELAY-BUS 2XP CTL [16XC] , P/BSW-EMER ELEC PWR/EMER GEN TEST [23XE] and C/B-CSM/G /EV/MAN/SPLY [6XE] .

Subtask 24-24-00-710-061-A

H. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:26:42 UTC